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(No Model. 2 Sheets-Sheet 1. O. ROTHROGK.

FEED WATER HEATER.

No. 318,396. Patented May 19, 1885.

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WITNESSES I v I flttd'fnay 2 Sheets-Sheet 2.

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O. BOT-BROOK.

FEED WATER HEATER. No. 318,396. v Patented May 19, 1885.

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Nrrnn Srarns A'rnNr FFICEQ OSCAR ROTHROCK, OF NEXV YORK, N. Y.

FEED-WATER HEATER.

SPECIFICATION forming part of Letters Patent No. 318,396, dated May 19,1885.

Application filed April 13, 1585.

To aZZ whom it may concern,

Be it known that I, OSCAR RoTHRooK, of New York city, in the county ofNew York and State of New York, have invented certain new and usefulImprovements in Feed-\Vater Heaters for Locomotive, Stationary, andMarine Boilers: and I do hereby declare that the following is a full,clear, and exact description of the invention, which will enable othersskilled in the art to which it appertains to make and use the same,reference being bad to the accompanying drawings, and to the letters ofreference marked thereon, which form part of this specification.

This invention relates to feed-water heaters for locomotive, stationary,and marine boilers, its object being to supply steam-boilers with feedwater of a high temperature, thereby greatly reducing the expense forfuel. It is especially applicable to locomotives and portable boilersgenerally, and can be used to advantage on many forms of marine andstationary boilers.

It consists of atank, reservoir, or dome and jacket secured to theoutside of the boiler,

forming either a separate and independent structure with walls of solidsheet metal on all sides, or a jacket-dome surrounding the fire-box or apart of the boiler, and having a connection at the fire, directly orindirectly.

with a pipe carrying the exhaust-steam from,

the exhaust-ports into the reservoir and from the reservoir back to thesmoke-box or to a suitable receptacle, from which it is allowed toescape into the air. The tank is provided with a safety-valve, gage,cocks, steam and water gages, and suitable connecting-pipes for thepassage of the hot water from it to the boiler or boilers, and forsupplying the heater. The tank or reservoir is riveted to the outsideshell of the boiler or constructed separately and secured by thetap-bolts or lugs and bolts or expansion-joint connections whennecessary in special cases; and where water of a very high temperatureis desired, and thereby the greatest economy of fuel, I make the heatera part of the walls of the fire-chamber, in certain cases placing theheater in front of the boiler, or both on top and in front of theboiler, and building the fire under both heater and boiler. XVhen it isdesired to control the heating directly at the fire, I place this (Nomodel.)

reservoir in front of the ordinary fire-door opening in a boiler, andsupply both the boiler or furnace and the heater with doors. The innerdoor or doors may then be lowered into a receptacle or swung out of theway and the outer door opened.

On small portable and agricultural engines, &c., I make the heater thefront or face of the fire-box, placing the fire-door and its connectionsout on the heater. For all of these different boilers I connect anamply-large pipe to one or both, usually both exhaust pots or ports, andfor a locomotive carry this pipe back under the lagging and covering ofthe boiler, or cover the pipe with felt or other suitable material andsecure it to the face of the boil er, securing it in position by clamps,usually along the foot-board to the cab, and run it up to the top of theheater, where it should enter in ordinary cases, give it any number ofcoils within the heater, and run it out at or near the bottom.

That portion of the pipe within the heater is usually made of very largeproportions, can be half the thickness of the outer extensions, and isusually made with the heater-tank securing it at entrance and exit bythe ordinary steam and water tight joints. The pipe may, however, passin and out of the heater in suitable steam-tight packing-boxes. The pipeat exit may be secured to the outer shell by tapbolts, and may be incommunication with a receptacle for transferring the water and steam tothe cold-water tank into the air or back to the smoke-box. I supply thispipe with a stop'cock or valve of ample proportions in an enlargedsection of the pipe near its entrance to the heater. I also supply itwith a large pipe or valve at or near its connection wit-h theexhaust-pots, or in the stack, which may be opened and closed by theengineer from his seat by a rod, lever, or thumb-screw. This rod isconnected to the cook or valve in the smoke-box, carried forward orupward to the engine-room, securing it in position along the foot-boardin ordinary cases, or otherwise as the special circumstances require.This arrangement enables the engine-man to blow up the fire with theexhaust, if necessary, throw it into the heater at will, let it escapeinto the air, or go back to the smoke-box. The heater has aconnecting-pipe at the top of the steam dome orsteam-space of theboiler, which is supplied with a valve or stop-cock to be closed whenpumping water from heater into the boiler of lower temperature thanthewater in the boiler,with one or two connecting-pipes for the, passage ofthe water from the heater to the boiler usually two pipes, the one beingsupplied with a slop-cock or valve, and the usual hot-water pump placedin the other, supply being arranged above the pump, so that the hotwater may run into it. This pipe may also be supplied with stop-cocks,and so arranged that the water may either flow or be pumped through it,or the pump used to supply the heater. It has a pipe conn'ecting it tothe cold-water tank or supply, and an ordinary injector or pump in thispipe to supply the heater with cold water.

In the drawings, Figure 1 is a side elevation of a locomotive, showingthe heater with the exhaust-pipe leading thereto and the rod foroperating the valve in the exhaust-nozzle. Fig. 2 is a cross -section ofthe heater and boiler, showing the heater when made sepa rate from theboiler. Fig. 3 is a sectional view showing the heater applied to theordinary jack or forward extension fire-box locomotive. Fig. 4 is asectional view showing the heater and in which it forms a jacket downthe face of the firebox. Fig. 5 is an end view of the smoke-box, showingthe valve and its rod for controlling the exhaust.

H is the heater on an ordinary locomotive, E being the pipe to exhaust;D, the pipe or extension of same carrying the exhaust from the heaterback to the stack into a receptacle or into the air; F, the rod runningfrom the cab to the-cock in the smoke-box; G, the co'ck'or valve in thepipe or in the exhaustpots, to be opened and closed by the engine man ascircumstances require; 0, cocks or valves in the pipe and in the exhaustpots or pipe. The heater may be a separate dome secured to the fire-boxby cars and tap-bolts, in this case having a bottom sheet.

a is the pipe to exhaust K, pipe to boiler, which may be duplicated, andS the safetyvalve; 0, cocks in all pipes; L, pipe from heater to thesteam-dome; a, pipe within the heater, &c., as shown by Fig. 3. Theheater is applied to the ordinary jacket or extension forward fire-boxlocomotive and to the other forms, the heater forming a dome andjacketon top and being either riveted to the shell of the boiler orconstructed separately therefrom and secured thereto. G is thesteam-gage of the heater; 0, water-cocks; S, safety-valve; I, connectionbetween the two domes, &c., as shown by Fig. 4., a section for theheater forming a jacket or tank down the face of the fire-box over thedoor. In this case it is understood that we supply all usual stays andbraces, that portion of the heater below the fire-door being a part ofthe fire-box, if desired, the extension down the front forming, usually,a jacket of twelve to twenty-four inches inthickness, the water-cocks,gages, &c., being either in the front or side of the heater-dome,"andwhen applied to locomotives the throttle-valve, rod, &c., being placedto one side of the heater, or run through it in ordinary packing-boxes,which-are duplicated. The heater in this instance may also form anindependent structure secured with'walls on all sides, so that it can bequickly'removed. Fig. 5 shows the pipe in the smoke-box, G being thecook or valve to which I attach the rod or lever running into cab, orwhich can be otherwise turned by an attendant to permit the engine toexhaust into stack. 7

The water can be arranged to be fed at intervals from the heater to theboiler, or can go constantly, can be pumped, injected, or be permittedto enter the boiler or boilers by gravity.

Having thus described myinvention, what I claim, and desire to secure byLetters Patent,

1. In a feed-waterheater, the combination of a boiler with a tanklocated on the boiler over the fire-box and an exhaust-steam pipepassing through the tank, substantially as described and shown.

2. In a feed-water heater, the combination of a boiler with a tanklocated on the boiler, an exhaust-steam pipe passing through the tank,and a valve for directing the exhaust through the pipe or up the stack.I

3. In a feed-water heater, the combination of the tankprovidedwith' thegage-cocks and 00 safety-valve with the exhaust-pipepassing throughit,said tank being located upon the boiler, substantiallyas described.

In testimony that I claim the foregoing as my own I affix my signaturein presence of 165 two witnesses. V

OSCAR ROTHROCK. f

W'itnesses:

SAMUEL D. LEVY, JOHN A. BELL.

